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Table 1 Groundwater Elevation and Analytical Data --m ARCO Service-Station No,-.2130- 7906 a:21307906 N. Et_ Dorado Street, Stockton, CA TOC Depth to Water Level Ethyl- Total Well Date P! Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenesim Number Sampled NP (feet msl) (feet bgs) (feet msl) {pg/L} (1rgIL) (Pg!L): {NgIL) (pglL) (/rglL) 1L) Comments MW-5 11!19!1997 - 15.10 46.62 -31.52 <50 -- 1.2 0.94 <0.5 0.91,;.__ 314!1998 - 15.10 41.90 -26.80 <50 5.6 1.8 1.6 3.1No FP,No S 6/26/1998 15.10 39.64 -24.54 <50 - 4.19 0.624 0.794 19/1/1998 - 15.10 41.44 -26.34 <50 - 13.2 <0.5 1.39 0.5351201998 - 15.10 38.74 -23.64 <50 0.693 <0.5 <0.5 <0.5 3/31/1999 -- 15.10 35.17 -20.07 <50 -- 1.33 0.586 <0.5 1.52 6/4/1999 - 15.10 36.48 -21.38 <50 - 5.03 0.721 <0.5 1.6 9/2/1999 - 15.10 41.05 -25.95 <50 - 6.14 <0.5 1.83 0.848 <5 -- 11/29/1999 - 15.10 39.16 -24.06 <50 0.585 0.633 <0.5 1.45 2.69 -- 3/16/2000 - 15.10 35.16 -20.06 57.1 -- 5.17 <0.5 <0.5 <0.5 4.93 6/26/2000 - 15.10 37.80 -22.70 52.3 -- 3.69 <0.5 2.2 0.825 <2[2] 9/28/2000 -- 15.10 42,05 -26.95 <50 - 1.34 <0.5 <0.5 <0.5 <2[2%7.8[21 -- 9111/2002 -- 12/19/2000 -- 15.10 37.68 -22.58 <50 - 0.561 9.49 <0.5 3 -- 3/15/2001 -- 15.10 35.50 -20.40 91.6[3] <2[4] 6.71 [4] <2[4] <2[4] ] -- 6/20/2001 -- 15.10 38.82 -23.72 78[3] - 2.5[4] 5.5[4] 4.7[4] 11[4] - 9/12/2001 - 15.10 43.05 -27.95 <50 - <2[4] <2[4] <2[4] <2[4] -- 12/12/2001 - 15.90 39.89 -24.79 <50 -- <1.0[4] <1.0[4] <1.0[4] 1.2[4] __3113!2002 -- 15.10 36.99 -21.89 <50 <0.50 0.61 <0.50 <0.50 -- 6/18/2002 -- 15.10 39.19 -24.09 <50 -- <0.50 0.61 <0.50 3.39/11/2002 - 15.10 44.33 -29.23 63 -- 3.4 5 1.914 - 12/18/2002 -- 15.10 41.68 -26.58 <50 -- <0.50 4.4 <0.50 5.8 03/06/2003 P 15.10 39.34 -24.24 <50 -- 1.5 1.7 0.51 3.2 3.0[2] 0.56 06!1112003 P 15.10 38.68 -23.58 51 - 2.7 5.5 1.2 8.4 4.2[2] 2.67 09/23/2003 P 15.10 42.70 -27.60 95 -- <2.5 2.5 <2.5 11 6.0[2] 12!0912003 P 15.10 41.73 -26.63 <50 - <0.50 <0,50 <0.50 0.79 <0.50[2] -- 03/09/2004 P 15.10 39.42 -24.32 950 34 0.66 7.1 <0.50 4.6[2] 2.08 06/23/2004 P 15.10 44.28 -29.18 66 -- 3.3 8.7 1.4 10 1.8[2] 2.43 09/20/2004 P 15.10 48.44 -33.34 <50 - <10 <10 <10 <10 <10[2] 0.80 12/21/2004 P 15.10 44.99 -29.89 330 -- 3.0 5.1 1.3 11 3.8[2] 1.30 Water Level Data 12/20/04 03/27!2005 P 15.10 41.74 -26.64 <50 - 0.78 1.4 0.60 3.4 6.8[2) 2.20 06/19/2005 P 15.10 42,10 -27.00 <50 -- 0.87 J 0.82 <0.50 2.1 4.4[2]J 2.60 09/1112005 P 15.10 46.64 -31.54 170 -- 5.4 6.4 3.2 15 1 14[2] 2.20 MW-6 12/4/1992 -- 94.55 63.40 NA 330 -- <0.5 <0.5 <0.5 <0.5 = NA - No FP,No S Report[late:October 21,2005 Page 12 of 24